Method of coating.



ttomey PATENTED JUNE 13, 1905.

L. HARKER. METHOD OF COATING.

APPLIOATION FILED SEPT. 3, 1904.

lNVE/VTOR Jam, aim

A w m a v u A UNITED STATES Patented Tune 13, 1905.

PATENT OEEIoE.

LEWIS A. I-IARKER, OF CINCINNATI, OHIO, ASSIGNOR TO THE SAFETY CANCOMPANY, OF CINCINNATI, OHIO.

METHOD OF COATING.

SPECIFICATION forming part of Letters Patent N 0. 792,028, dated June13, 1905. Application filed September 3, 1904. Serial No. 223,280.

To all whom it may concern.-

Be it known that I, LEwIs A. HARKER, a resident of Cincinnati, in thecounty of I-Iamilton and State of Ohio, have invented certain new anduseful Improvements in Methods of Coating; and'I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it apper tains tomake and use the same.

My invention relates to an improved method of coating, the object of theinvention being to provide an improved method of coating cans and thelike receptacles, which will result in locating the greatest portion ofthe coating material where it is most needed to protect the receptacles;and it consists in certain novel steps in the method, as will be morefully hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in section illustratingthe carrying out of my method. Fig. 2 is a view of the bottomcan-closure, and Fig. 3 is a view of the completed can after the methodis carried out.

In the manufacture of cans, particularly for use as garbage-cans, theyare ordinarily composed of black steel and when assembled are coatedwith zinc, or what is known as galvanizing. In dipping or submergingthem in the hot bath of zinc they are put into the metal open end first,the same as dipping water with a bucket. When the can is whollysubmerged and turned over, so that the molten zinc will entirely coatit, it is withdrawn gradually, bottom end first that is, in an invertedpositionso that the molten metal will flow out of its interior. This hasa great tendency to draw the coat ing from the bottom and sides, leavinga comparatively thin coating in the bottom and along the lower ortion ofthe sides. The drip, as it is cal ed, is at that portion of the canwhich last leaves the bath, which in this case is the top or open end ofthe can. I have found in actual use that the weak portion of thesegarbage-cans is at the base at a point just above the bottom. Here iswhere they give out first, and the cause is that the fluids from thegarbage attack the can, as they lie at this point therein. To overcomethis as much as possible, I propose to coat the can in such a manner asto withdraw it from the bath bottom end last, the position of the canwhen being withdrawn being in its upright position, as shown in Fig. 1.To do this, I stamp out a circle of metal in the bottom, preferablyabout three inches in diameter. In other words, I make a three-inch hole1 in the center of the bottom, which is at the lowest point. This holein the bottom permits the can to be withdrawn from the tank in anupright position, the molten metal running out of the can through thishole. In this way I secure at the base of the can a very heavy coatingof Zinc, both on the interior and exterior, and at the same time themetal remains in the oints formed by the union of the bottom to thecylinder portion. After the can is thus dipped I close the hole left inthe bottom by inserting a metal cap 2, the edge of which after insertionis crimped outwardly and pressed against the edge of the hole in thebottom. After the plug or cap is thus inserted and pressed against thebottom it is made watertight by soldering.

I-Iaving fully described my invention,what I claim as new, and desire tosecure by Letters Patent, is

1. The herein-described method, consisting in immersing a receptaclehaving a bottom provided with an opening in a bath of coating material,and withdrawing said receptacle bottom downward from the bath.

2. The herein-described method, consisting in providing an opening inthe bottom of a receptacle submerging the receptacle in a end downwardfrom the molten zinc, then 10 bath of coatmg material, then drawlng thesecuring a closure 1n the o )emng 1n the can.

receptacle with its bottom end downward In testimony whereof have signedthis from said bath and then closing the opening specification in thepresence of two subscrib- 5 in the bottom of the receptacle. ingwitnesses.

I 3. The herein-described method, consist- LEWIS A. I-IARKER.

ing in first providing an opening in the bot- Witnesses:

tom of a can, then submerging the can in R. DE V. CARROLL,

molten zinc, then drawing the can bottom I JoNAs B. FRENTIL.

